Brotherhood Trooper

Multiattack. The trooper makes two melee attacks, or makes one attack with its wrist device. A trooper can only have one type of wrist device equipped (decided by the DM).

Hammer. Melee or Ranged Weapon Attack: +7 to hit, reach 5 ft. and range 20/60 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage

Flamethrower. The trooper blasts all creatures in a 15-foot cone for 3d6 Fire damage, or half as much on a DC14 Dexterity Save.

Grapple hook. The trooper makes a ranged attack (+7 hit, range 60/120 feet), at advantage if the target is wearing metal armor. On a successful hit, the target takes 1d6 lightning damage and must make a DC14 Strength save or be pulled 20 feet towards the trooper. If the target lands within melee range of the trooper, it takes a Hammer attack on the target as a free action, rolling with advantage.

Railgun All creatures in a 120-foot line from the trooper must make a DC14 Dexterity saving throw or take 4d6 Force damage. Creatures take half damage on a successful save.

Bodyguard. If the trooper is guarding  a Brotherhood of Steel officer, and that officer is within 5 feet and would take damage from an attack, the trooper can take damage  from that attack instead.